diff --git a/.github/workflows/cache.yml b/.github/workflows/cache.yml
index 6386349..0f39d84 100644
--- a/.github/workflows/cache.yml
+++ b/.github/workflows/cache.yml
@@ -8,7 +8,7 @@ jobs:
   cache:
     runs-on: "runs-on=${{ github.run_id }}/family=g4dn.2xlarge/image=quantecon_ubuntu2404/disk=large"
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           ref: ${{ github.event.pull_request.head.sha }}
       - name: Setup Anaconda
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b85d3bb..e703e20 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -4,7 +4,7 @@ jobs:
   preview:
     runs-on: "runs-on=${{ github.run_id }}/family=g4dn.2xlarge/image=quantecon_ubuntu2404/disk=large"
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           ref: ${{ github.event.pull_request.head.sha }}
       - name: Setup Anaconda
diff --git a/.github/workflows/collab.yml b/.github/workflows/collab.yml
index ae83d44..c1dc5fe 100644
--- a/.github/workflows/collab.yml
+++ b/.github/workflows/collab.yml
@@ -7,7 +7,7 @@ jobs:
       image: docker://us-docker.pkg.dev/colab-images/public/runtime
       options: --gpus all
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           ref: ${{ github.event.pull_request.head.sha }}
       - name: Check nvidia drivers
diff --git a/.github/workflows/linkcheck.yml b/.github/workflows/linkcheck.yml
index d32436a..d09749d 100644
--- a/.github/workflows/linkcheck.yml
+++ b/.github/workflows/linkcheck.yml
@@ -16,7 +16,7 @@ jobs:
         python-version: ["3.12"]
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Setup Anaconda
         uses: conda-incubator/setup-miniconda@v3
         with:
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index a0b33ac..fd7a41e 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -9,7 +9,7 @@ jobs:
     runs-on: "runs-on=${{ github.run_id }}/family=g4dn.2xlarge/image=quantecon_ubuntu2404/disk=large"
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Setup Anaconda
         uses: conda-incubator/setup-miniconda@v3
         with: